Spontaneous transition and concomitant self-assembly of CdTe nanoparticles into CdS nanosheets induced by L-cysteine

Dawei Deng; Yueqing Gu

doi:10.1117/12.807358

2 March 2009 Spontaneous transition and concomitant self-assembly of CdTe nanoparticles into CdS nanosheets induced by L-cysteine

Dawei Deng, Yueqing Gu

Author Affiliations +

Proceedings Volume 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications; 719017 (2009) https://doi.org/10.1117/12.807358
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

In this paper, we investigated carefully the influence of the added L-cysteine on the stability of mercaptopropionic acid (MPA)-stabilized CdTe nanoparticles (NPs). Transmission electron microscopy (TEM) imaging revealed that the addition of pH ~11.5 L-cysteine solution could reduce the stability of MPA-capped CdTe NPs, which resulted in the formation of sheet-shaped nanostructures finally after about seven days of storage in darkness under ambient conditions. The typical size of these resulting nanosheets was ~6 μm in length, ~1 μm in width and ~50 nm in thickness. The high-resolution TEM characterization and elemental analysis from energy-dispersed X-ray (EDX) spectrum indicated that these resulting sheets were made from well-crystallized nanopartilces (~4 nm) of CdS rather than CdTe. In addition, XRD analysis and optical microscopy also supported further these experimental observations. Hence, here, the post addition of L-cysteine induced the spontaneous transition and concomitant self-assembly of MPA-stabilized CdTe nanoparticles into luminescent CdS nanosheets.

Citation Download Citation

Dawei Deng and Yueqing Gu "Spontaneous transition and concomitant self-assembly of CdTe nanoparticles into CdS nanosheets induced by L-cysteine", Proc. SPIE 7190, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications, 719017 (2 March 2009); https://doi.org/10.1117/12.807358

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available